US STOCKS-Wall St inches up as ISM data offsets Ukraine worries
* Services sector grows in April, fastest pace in 8 months
* JPMorgan leads banks lower after trading revenue warning
* Pfizer's revenue below expectations, shares fall
* Dow up 0.2 pct, S&P up 0.2 pct, Nasdaq up 0.3 pct (Updates to afternoon)
By Caroline Valetkevitch
NEW YORK, May 5 (Reuters) - U.S. stocks were up slightly on Monday as concerns over an escalation of tensions between Ukraine and pro-Russia separatists were offset by data showing strength in the services sector.
The Institute for Supply Management said its services sector index rose in April, hitting the fastest pace in eight months and topping expectations.
Shares had opened lower, weighed by geopolitical events as Ukrainian forces were ambushed by separatists on Monday, triggering heavy fighting on the outskirts of the rebel stronghold of Slaviansk, a day after a Ukrainian police station in Odessa was stormed.
"We shook off a lot of the morning jitters, and the ISM services came out and showed pretty good growth, and that obviously brought back some buyers," said Ryan Detrick, senior technical strategist at Schaeffer's Investment Research in Cincinnati, Ohio. Continuación...